R06 - M Sandstone Bib Overalls Carhartt's duck bib overall is constructed of rugged 12-ounce, 100% cotton sandstone duck. It features multiple utility and tool pockets, hammer loop, brush loop, and double knees with cleanout bottoms to accommodate knee pads. Back pockets are reinforced for durability. *12-ounce, 100% cotton sandstone duck, heavyweight *Un-lined *Double knees